手法を比較

	オンライン・デルファイ法（e-Delphi）	デルファイ法
分野	調査方法論	調査方法論
系統	Process / pipeline	Process / pipeline
提唱年	Original Delphi: 1950s–1960s; Online variant: mid-1990s onwards	1950s–1963
提唱者	Olaf Helmer, Norman Dalkey, Nicholas Rescher (RAND Corporation); online adaptation emerged in the 1990s–2000s	Norman Dalkey and Olaf Helmer (RAND Corporation)
種類	Iterative expert consensus method (online)	Iterative expert consensus technique
原典	Hasson, F., Keeney, S., & McKenna, H. (2000). Research guidelines for the Delphi survey technique. Journal of Advanced Nursing, 32(4), 1008–1015.	Dalkey, N., & Helmer, O. (1963). An experimental application of the Delphi method to the use of experts. Management Science, 9(3), 458–467.
別名	e-Delphi, electronic Delphi, web-based Delphi, internet Delphi	Delphi method, Delphi survey, expert consensus method, iterative expert panel
関連	5	6
概要	The Online Delphi Technique (e-Delphi) is an iterative, web-mediated consensus method in which a geographically dispersed panel of experts responds to successive rounds of structured questionnaires distributed and collected via email or a web platform. Anonymous feedback and controlled statistical summaries are fed back between rounds, guiding panellists toward convergence on priorities, predictions, or recommendations without the social pressures of face-to-face group discussion.	The Delphi technique is a structured, multi-round data collection method that harvests and refines expert opinion through iterative questionnaires and controlled feedback. Developed at RAND Corporation in the 1950s, it is designed to converge a dispersed expert panel toward a reliable consensus on complex, uncertain, or future-oriented questions — without the conformity pressures of face-to-face group discussion.